我使用以下指令是因为我想重新验证两个输入字段，无论值 1 还是值 2 已更改：

指示：

'use strict';

angular.module('myApp').directive('equals', function() {
  return {
    restrict: 'A', // only activate on element attribute
    require: '?ngModel', // get a hold of NgModelController
    link: function(scope, elem, attrs, ngModel) {
      if(!ngModel) return; // do nothing if no ng-model

      // watch own value and re-validate on change
      scope.$watch(attrs.ngModel, function() {
        validate();
      });

      // observe the other value and re-validate on change
      attrs.$observe('equals', function (val) {
        validate();
      });

      var validate = function() {
        // values
        var val1 = ngModel.$viewValue;
        var val2 = attrs.equals;

        // set validity
        ngModel.$setValidity('equals', ! val1 || ! val2 || val1 === val2);
      };
    }
  }
});

用法

<input type="password" ng-model="value1" equals="{{value2}}" required>
<input type="password" ng-model="value2" equals="{{value1}}" required>

不需要为此创建单独的指令。已经有一个内置的 Angular UI 密码验证工具。有了这个，你可以这样做：

<input name="password" required ng-model="password">
<input name="confirm_password"
       ui-validate=" '$value==password' "
       ui-validate-watch=" 'password' ">

 Passwords match? {{!!form.confirm_password.$error.validator}}

这应该解决它：

看法：

<div ng-controller='Ctrl'>
   <form name='form'>
      <input data-ng-model='user.password' type="password" name='password' placeholder='password' required>
      <div ng-show="form.password.$error.required">
        Field required</div>
      <input ng-model='user.password_verify' type="password" name='confirm_password' placeholder='confirm password' required data-password-verify="user.password">
      <div ng-show="form.confirm_password.$error.required">
        Field required!</div>
      <div ng-show="form.confirm_password.$error.passwordVerify">
        Fields are not equal!</div>
   </form
</div>

指示

var app = angular.module('myApp', []);

app.directive("passwordVerify", function() {
   return {
      require: "ngModel",
      scope: {
        passwordVerify: '='
      },
      link: function(scope, element, attrs, ctrl) {
        scope.$watch(function() {
            var combined;

            if (scope.passwordVerify || ctrl.$viewValue) {
               combined = scope.passwordVerify + '_' + ctrl.$viewValue; 
            }                    
            return combined;
        }, function(value) {
            if (value) {
                ctrl.$parsers.unshift(function(viewValue) {
                    var origin = scope.passwordVerify;
                    if (origin !== viewValue) {
                        ctrl.$setValidity("passwordVerify", false);
                        return undefined;
                    } else {
                        ctrl.$setValidity("passwordVerify", true);
                        return viewValue;
                    }
                });
            }
        });
     }
   };
});

对此的另一种看法是将一个输入的模型与另一个输入的值相匹配。

app.directive('nxEqual', function() {
    return {
        require: 'ngModel',
        link: function (scope, elem, attrs, model) {
            if (!attrs.nxEqual) {
                console.error('nxEqual expects a model as an argument!');
                return;
            }
            scope.$watch(attrs.nxEqual, function (value) {
                model.$setValidity('nxEqual', value === model.$viewValue);
            });
            model.$parsers.push(function (value) {
                var isValid = value === scope.$eval(attrs.nxEqual);
                model.$setValidity('nxEqual', isValid);
                return isValid ? value : undefined;
            });
        }
    };
});

因此，如果密码框的模型是，login.password那么您在验证框上设置以下属性：nx-equal="login.password"，并测试formName.elemName.$error.nxEqual. 像这样：

<form name="form">
    <input type="password" ng-model="login.password">
    <input type="password" ng-model="login.verify" nx-equal="login.password" name="verify">
    <span ng-show="form.verify.$error.nxEqual">Must be equal!</span>
</form>

扩大的视野：

对于我的一个新项目，我不得不修改上述指令，以便它仅nxEqual在验证输入具有值时才显示错误。否则nxEqual应该消除错误。这是扩展版本：

app.directive('nxEqualEx', function() {
    return {
        require: 'ngModel',
        link: function (scope, elem, attrs, model) {
            if (!attrs.nxEqualEx) {
                console.error('nxEqualEx expects a model as an argument!');
                return;
            }
            scope.$watch(attrs.nxEqualEx, function (value) {
                // Only compare values if the second ctrl has a value.
                if (model.$viewValue !== undefined && model.$viewValue !== '') {
                    model.$setValidity('nxEqualEx', value === model.$viewValue);
                }
            });
            model.$parsers.push(function (value) {
                // Mute the nxEqual error if the second ctrl is empty.
                if (value === undefined || value === '') {
                    model.$setValidity('nxEqualEx', true);
                    return value;
                }
                var isValid = value === scope.$eval(attrs.nxEqualEx);
                model.$setValidity('nxEqualEx', isValid);
                return isValid ? value : undefined;
            });
        }
    };
});

你会像这样使用它：

<form name="form">
    <input type="password" ng-model="login.password">
    <input type="password" ng-model="login.verify" nx-equal-ex="login.password" name="verify">
    <span ng-show="form.verify.$error.nxEqualEx">Must be equal!</span>
</form>

试试看：http : //jsfiddle.net/gUSZS/

我是在没有指令的情况下完成的。

<input type="password" ng-model="user.password" name="uPassword" required placeholder='Password' ng-minlength="3" ng-maxlength="15" title="3 to 15 characters" />
    <span class="error" ng-show="form.uPassword.$dirty && form.uPassword.$error.minlength">Too short</span>
    <span ng-show="form.uPassword.$dirty && form.uPassword.$error.required">Password required.</span><br />

    <input type="password" ng-model="user.confirmpassword" name="ucPassword" required placeholder='Confirm Password' ng-minlength="3" ng-maxlength="15" title="3 to 15 characters" />
    <span class="error" ng-show="form.ucPassword.$dirty && form.ucPassword.$error.minlength">Too short</span>
    <span ng-show="form.ucPassword.$dirty && form.ucPassword.$error.required">Retype password.</span>
    <div ng-show="(form.uPassword.$dirty && form.ucPassword.$dirty) && (user.password != user.confirmpassword)">
        <span>Password mismatched</span>
    </div>